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POInternal Error on jQuery Autocomplete ajax call to ASP.NET
 

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  1. POInternal Error on jQuery Autocomplete ajax call to ASP.NET
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    <p>For some reason I am getting an Internal Error (500) when I am attempting to get a List of strings from an ASP.NET method. I have tried many different ways of writing it and an entire page of google is all purple but to no avail. Perhaps maybe you guys can spot something I am completely missing.</p> <p>Here is the HTML/Javascript</p> <pre><code>&lt;%@ Page Title="" Language="C#" MasterPageFile="~/Site1.Master" AutoEventWireup="true" CodeBehind="messaging.aspx.cs" Inherits="xxx.messaging" %&gt; &lt;asp:Content ID="Content1" ContentPlaceHolderID="content" runat="server"&gt; &lt;link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" /&gt; &lt;script type="text/javascript"&gt; $(document).ready(function () { //$(".selectable").selectable(); $('[id$="username_textbox"]').autocomplete({ source: function (request, response) { $.ajax({ type: "POST", contentType: "application/json; charset=utf-8", url: "Services.asmx/getFollowingUsernames", dataFilter: function (data) { return data; }, data: "{'prefixText': '" + request.term + "' }", dataType: "json", success: function (data) { response(data.d); }, error: function (xhr, textStatus, errorThrown) { var errorMessage = "Ajax error: " + this.url + " : " + textStatus + " : " + errorThrown + " : " + xhr.statusText + " : " + xhr.status; if (xhr.status != "0" || errorThrown != "abort") { alert(errorMessage); } } }); }, search: function (event, ui) { $('.spinner').show(); }, response: function (event, ui) { $('.spinner').hide(); }, minLength: 1 }); }); &lt;/script&gt; &lt;div class="messaging_wrapper"&gt; &lt;div class="conversations_list" runat="server"&gt; &lt;asp:Button ID="new_message" runat="server" Text="New Message" /&gt; &lt;ol id="conversation_ol" class="selectable" runat="server"&gt; &lt;/ol&gt; &lt;/div&gt; &lt;div id="conversation_wrapper" class="converation_div" runat="server"&gt; &lt;div id="conversation_head"&gt; &lt;asp:TextBox ID="username_textbox" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;img src="images/ajax-loader.gif" style="display:none" class="spinner" /&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/asp:Content&gt; </code></pre> <p>Here is the WebService code:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Services; namespace xx.App_Code { [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [System.ComponentModel.ToolboxItem(false)] // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. // [System.Web.Script.Services.ScriptService] public class Services : System.Web.Services.WebService { [WebMethod] public List&lt;string&gt; getFollowingUsernames(string prefixText) { SessionAdapter sa = new SessionAdapter(); int id = sa.getUserID(); MembershipAdapter ma = new MembershipAdapter(); List&lt;int&gt; ids = new List&lt;int&gt;(); ids = ma.getUserFollowingList(id); List&lt;string&gt; usernames = new List&lt;string&gt;(); foreach (int userID in ids) { usernames.Add(ma.getUserName(userID.ToString())); } return usernames; } } } </code></pre> <p>Here is what the internal error is:</p> <p><img src="https://i.stack.imgur.com/q5GTg.png" alt="enter image description here"></p>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USIan McCullough
    1. USIan McCullough
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

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